Canadian Forest Service Publications
Effects of density on the proportion of male and female pupae in gypsy moth populations. 1985. Mauffette, Y.; Jobin, L.J. The Canadian Entomologist 117: 535-539.
Issued by: Laurentian Forestry Centre
Catalog ID: 14790
Availability: PDF (request by e-mail)
The numbers of larvae and pupae of the gypsy moth, Lymantri dispar L., were monitored in southwestern Quebec from June through August 1980 at 13 sites. In 10 sites, the proportion of male pupae was significantly different from an expected proportion of 0.5. Linear-regression analyses of the proportion of male pupae on larval density showed a significant increase in the number of male pupae with increasing larval density. Changes in the sex ratio could be an important indicator of the dynamic state of a population, and should be considered in modeling the population dynamics of gypsy moth.